Terminal, radio communication method, and base station

ABSTRACT

A terminal is disclosed including a processor that scales a delay requirement of an intra-frequency measurement based on a synchronization signal block by a scaling factor corresponding to each of a plurality of carriers; and a receiver that receives the synchronization signal block in each of the plurality of carriers, wherein a specified carrier out of the plurality of carriers satisfies a condition, wherein a first scaling factor for an unspecified carrier out of the plurality of carriers is based on a number of the plurality of carriers, and wherein a second scaling factor for the specified carrier is not based on the number of the plurality of carriers. In other aspects, a radio communication method and a base station are also disclosed.

TECHNICAL FIELD

The present disclosure relates to a user terminal and a radiocommunication method in next-generation mobile communication systems.

BACKGROUND ART

In the UMTS (Universal Mobile Telecommunications System) network, thespecifications of Long Term Evolution (LTE) have been drafted for thepurpose of further increasing high speed data rates, providing lowerlatency and so on (see Non-Patent Literature 1). For the purpose offurther high capacity, advancement of LTE (LTE Rel. 8, Rel. 9), and soon, the specifications of LTE-A (LTE-Advanced, LTE Rel. 10, Rel. 11,Rel. 12, Rel. 13) have been drafted.

Successor systems of LTE (referred to as, for example, “FRA (FutureRadio Access),” “5G (5th generation mobile communication system),”“5G+(plus),” “NR (New Radio),” “NX (New radio access),” “FX (Futuregeneration radio access),” “LTE Rel. 14,” “LTE Rel. 15” (or laterversions), and so on) are also under study.

In existing LTE systems (for example, LTE Rel. 8 to Rel. 13), a userterminal (UE (User Equipment)) detects a synchronization signal (SS),synchronizes with a network (for example, a base station (eNB: eNode B),and identifies a cell to which the user terminal is to connect (forexample, using a cell ID (Identifier). Such processing is referred to ascell search. Examples of the synchronization signal include a PSS(Primary Synchronization Signal) and/or an SSS (SecondarySynchronization Signal).

A UE receives broadcast information (for example, master informationblock (MIBs), system information blocks (SIBs), and so on) to acquireconfiguration information for communication with the network (theinformation may also be referred to as system information).

MIBs may be transmitted on a broadcast channel (PBCH (Physical BroadcastChannel), and SIBs may be transmitted on a downlink (DL) shared channel(PDSCH (Physical Downlink Shared Channel).

CITATION LIST Non-Patent Literature

Non-Patent Literature 1: 3GPP TS 36.300 V8.12.0 “Evolved UniversalTerrestrial Radio Access (E-UTRA) and Evolved Universal TerrestrialRadio Access Network (E-UTRAN); Overall description; Stage 2 (Release8),” April, 2010

SUMMARY OF INVENTION Technical Problem

In a future radio communication system (hereinafter also simply referredto as an NR), measurement using synchronization signal blocks (SSBs) isutilized. SSB-based measurement timing configuration (SMTC) is signaledto the UE. The UE performs, in a configured SMTC window, measurementbased on an SSB to be measured.

In a case where intra-frequency measurement are performed in each of aplurality of carriers, the SMTC window may overlap among the pluralityof carriers. In this case, when intra-frequency measurement is notappropriately performed, this may lead to degradation in communicationthroughput, frequency use efficiency, and so on.

Thus, an object of the present disclosure is to provide a user terminaland a radio communication method that can appropriately performintra-frequency measurement in each of the plurality of carriers.

Solution to Problem

A user terminal according to an aspect of the present disclosureincludes a control section that scales a delay requirement of anintra-frequency measurement based on a synchronization signal block by ascaling factor corresponding to each of a plurality of carriers; and areceiving section that receives the synchronization signal block in eachof the plurality of carriers. A specified carrier out of the pluralityof carriers satisfies a given condition. A first scaling factor for anunspecified carrier out of the plurality of carriers is based on anumber of the plurality of carriers. A second scaling factor for thespecified carrier is not based on the number of the plurality ofcarriers.

Advantageous Effects of Invention

According to the aspect of the present disclosure, the intra-frequencymeasurement can be appropriately performed in each of the plurality ofcarriers.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram to show an example of an operation of a cellsearcher;

FIG. 2 is a diagram to show an example of intra-frequency measurement ineach of a plurality of carriers;

FIG. 3 is a diagram to show another example of intra-frequencymeasurement in each of the plurality of carriers;

FIG. 4 is a diagram to show an example of a schematic structure of aradio communication system according to one embodiment;

FIG. 5 is a diagram to show an example of an overall structure of aradio base station according to one embodiment;

FIG. 6 is a diagram to show an example of a functional structure of theradio base station according to one embodiment;

FIG. 7 is a diagram to show an example of an overall structure of a userterminal according to one embodiment;

FIG. 8 is a diagram to show an example of a functional structure of theuser terminal according to one embodiment; and

FIG. 9 is a diagram to show an example of a hardware structure of theradio base station and the user terminal according to one embodiment.

DESCRIPTION OF EMBODIMENTS

In existing LTE systems, a UE supports inter-frequency measurement inwhich the UE performs measurement in a non-serving carrier differentfrom a serving carrier which serves to the UE.

At a measurement gap (MG), the UE switches a use frequency (RF) from theserving carrier to the non-serving carrier (retuning), performmeasurement by using a reference signal and so on, and then switches theuse frequency from the non-serving carrier to the serving carrier.

Here, the MG is a period when inter-frequency measurement are performed,and during the period, the UE stops transmissions/receptions in thecarrier currently used for communication and performs measurement in acarrier of another frequency.

In LTE, while inter-frequency carriers are being measured by using MGs,transmissions/receptions in a serving cell are precluded due toswitching of the RF. On the other hand, in other cases (for example,intra-frequency measurement), no transmission/reception constraint isimposed on the measurement.

In NR, the following measurements are under study:

(1) Intra-frequency measurement without MG,

(2) Intra-frequency measurement with MG, and

(3) Inter-frequency measurement.

The intra-frequency measurement without MG in (1) described above arealso referred to as intra-frequency measurement without RF retuning. Theintra-frequency measurement with MG in (2) described above are alsoreferred to as intra-frequency measurement with RF retuning. Forexample, in a case where a signal to be measured is not included in aband corresponding to an active bandwidth part (BWP), evenintra-frequency measurement require RF retuning and thus correspond tothe measurement in (2) described above.

Here, the BWP corresponds to one or more partial frequency bands in acomponent carrier (CC) configured in NR. The BWP may be referred to as a“partial frequency band,” a “partial band,” and the like.

The inter-frequency measurement in (3) described above are also referredto as inter-frequency measurement. The inter-frequency measurement areassumed to use MGs. However, in a case where the UE reports a UEcapability of gap less measurement to a base station (also referred toas, for example, a BS, a transmission/reception point (TRP), an eNB(eNodeB), a gNB (NR NodeB), or the like), inter-frequency measurementwithout MGs are enabled.

In NR, while intra-frequency carriers or inter-frequency carriers arebeing measured by using MGs, transmission/reception in the serving cellis precluded due to switching of the RF.

In LTE, NR, and so on, regarding the intra-frequency measurement and/orthe inter-frequency measurement, the measurement may be performed on atleast one of reference signal received power (RSRP), received signalstrength indicator (RSSI), a reference signal received quality (RSRQ),and a signal to interference plus noise ratio (SINR) of non-servingcarriers.

Here, the RSRP is the received power of a desired signal, and ismeasured by using at least one of, for example, a cell-specificreference signal (CRS), a channel state information-reference signal(CSI-RS), and so on. The RSSI is total received power including thereceived power of the desired signal and interference and noise power.The RSRQ is the ratio of the RSRP to the RSSI.

The desired signal may be a signal included in a synchronization signalblock (SSB). The SSB is a signal block including a synchronizationsignal (SS) and a broadcast channel (also referred to as a broadcastsignal, a PBCH, an NR-PBCH, or the like) and may also be referred to asan SS/PBCH block.

Examples of the SS may include a PSS (Primary Synchronization Signal),an SSS (Secondary Synchronization Signal), an NR-PSS, an NR-SSS. The SSBis constituted of one or more symbols (for example, OFDM symbols). Inthe SSB, the PSS, the SSS, and the PBCH may be allocated in one or moredifferent symbols. For example, the SSB may be constituted of a total offour or five symbols including the PSS in one symbol, the SSS in onesymbol, and the PBCH in two or three symbols.

Note that measurement using the SS (or SSB) may be referred to as SS (orSSB) measurement. The SS (or SSB) measurement may include measurementof, for example, the SS-RSRP, the SS-RSRQ, and the SS-SINR.

The UE may communicate (perform transmission/reception, measurement, andso on of signals) by using at least one frequency band (carrierfrequency) of a first frequency range (FR1 (Frequency Range 1)) and asecond frequency band (FR2 (Frequency Range 2)).

For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz),and FR2 may be a frequency band which is higher than 24 GHz (above-24GHz). FR1 may be defined as a frequency range using at least one of 15kHz, 30 kHz, and 60 kHz as a sub-carrier spacing (SCS), and FR2 may bedefined as a frequency range using at least one of 60 kHz and 120 kHz asan SCS. Note that frequency bands, definitions and so on of FR1 and FR2are by no means limited to these, and for example, FR1 may correspond toa higher frequency band than FR2.

FR2 may be used exclusively for a time division duplex (TDD) band. FR2is preferably used synchronously among a plurality of base stations. Ina case where FR2 includes a plurality of carriers, the carriers arepreferably used synchronously.

The UE may obtain information related to intra-frequency measurementand/or inter-frequency measurement signaled (configured) from the basestation by using, for example, higher layer signaling, physical layersignaling, or a combination thereof.

Here, for example, the higher layer signaling may be any one orcombinations of RRC (Radio Resource Control) signaling, MAC (MediumAccess Control) signaling, broadcast information, and the like.

For example, the MAC signaling may use MAC control elements (MAC CE),MAC PDUs (Protocol Data Units), and the like. For example, the broadcastinformation may be master information blocks (MIBs), system informationblocks (SIBs), minimum system information (RMSI (Remaining MinimumSystem Information)), and the like.

Information related to intra-frequency measurement and/orinter-frequency measurement may include, for example, a frequency band(carrier) to be measured, the presence (or absence) of synchronizationof the carrier to be measured, a resource position (a slot number, asymbol number, an RB index, and so on) for a signal to be measured, anSSB-based measurement timing configuration (SMTC), and an index of anSSB to be measured. The SSB index may be associated with the resourceposition for the SSB.

Note that the presence (or absence) of synchronization of the carrier tobe measured may be configured in the UE by RRC signaling by using, forexample, information (that may also be referred to as a parameter“useServingCellTimingForSync”) regarding whether the carrier to bemeasured is in synchronization with the serving cell (whether an SSBindex transmitted by a neighboring cell can be derived, based on atiming for the serving cell).

The index of the SSB to be measured may be signaled by using a bit map(that may also be referred to as a parameter “ssb-ToMeasure”). The bitmap may be associated with a frequency band to be measured. For example,for a higher frequency band to be measured, a longer bit map may be usedto signal the SSB index.

The SMTC may include the duration, periodicity, timing offset, and so onof an of an SSB measurement period (that may also be referred to as anSMTC window, a measurement timing, or the like). The UE performs, in aconfigured SMTC window, measurement based on the SSB to be measured.

UE capability signaling for configuring MG for inter-frequencymeasurement may be supported. For the UE capability signaling, the MGfor inter-frequency measurement can be configured, for example,separately for FR1 and FR2.

For example, the UE may report capability signaling including an MGlength (or duration), an MG repetition interval, and the like for gapscorresponding to at least one of the gap for each FR1, the gap for eachFR2, and the gap for each UE.

In LTE, for a delay requirement for the intra-frequency measurement(Intra-frequency measurement), the presence (or absence) of at least oneof CA (Carrier Aggregation) and DC (Dual Connectivity) and the number ofcarriers configured as secondary cells (SCells) are not particularlytaken into account.

The intra-frequency measurement in LTE can be performed at arbitrarytimings, and thus even in a case where the UE includes only one or asmall number of cell searchers (cell search functions) (only one or asmall number of cell searchers are implemented in the UE), the cellsearcher(s) can be used (shared or reused) to measure different CCs(Component Carriers) at different timings.

In NR, an SMTC indicating at least one of the timing, periodicity, andduration (length of time) for the intra-frequency measurement isconfigured for each carrier (CC).

Given implementation costs and the like of the UE, only one or a smallnumber of cell searchers are preferably implemented and used to measurea plurality of CCs, like LTE.

However, in a case where the SMTC window is configured at overlappingtimings during a plurality of CCs, simultaneous measurement of aplurality of CCs using one cell searcher is precluded. Accordingly, thedelay requirement for the intra-frequency measurement for a case ofoverlapping SMTC windows is preferably specified.

Study has been conducted on scaling of the delay requirement dependingon the number of CCs to be measured for which overlapping SMTC windowsare configured. For example, in a case where SMTC windows with aperiodicity of 40 ms completely overlap during CA of two CCs, the UEassumes that a measurement periodicity for each CC is 80 ms instead of40 ms.

In this manner, the UE and the base station can relax the delayrequirement by increasing an SMTC periodicity. For example, the delaytime as a delay requirement is represented in the periodicity multipliedby the number of samples.

In a case where CA or DC is performed, for PCells (primary cells),PSCells (primary secondary cells), and SCells (secondary cells), theintra-frequency measurement of the PCells and PSCells are preferablygiven priority over the intra-frequency measurement of the SCells. Thus,study has been conducted on avoidance of the above-described scalingdepending on the number of CCs from being applied to at least one of thePCells and PSCells.

In a case where the scaling is not applied to at least one of the PCellsand PSCells, in the implementation of the UE, a dedicated cell searcherneeds to be implemented in the at least one of the PCells and PSCells,as shown in FIG. 1 . For example, in a case where one PCell, one PSCell,and one SCell are configured, three cell searchers are configured.

This implementation ensures that, even in a case where an SMTC windowfor at least one of the PCell and the PSCell overlaps an SMTC window inanother CC, measurement can be inevitably performed on at least one ofthe PCell and PSCell at a periodicity and a timing configured by theSMTC. However, there is a problem of high implementation costs.

Thus, the present inventors came up with the idea of a UE operation forappropriately performing intra-frequency measurement on the carrier tobe given priority in view of mobility while suppressing an increase inthe number of cell searchers implemented in the UE.

Embodiments according to the present disclosure will be described indetail with reference to the drawings as follows. A radio communicationmethod according to each embodiment may be employed independently or maybe employed in combination.

(Radio Communication Method)

In an embodiment, the UE and/or the base station may perform scaling,based on the number of carriers including overlapping SMTC windows, asthe delay requirement for the intra-frequency measurement for a case ofperforming at least one of CA and DC. In the scaling, the delayrequirement for each carrier may be defined by treating a specifiedcarrier (that meets a condition) differently from the other carriers.

The UE and the radio base station may determine, for the scaling, ascaling factor (a coefficient or a multiplier), based on theconfiguration of each carrier.

The UE and the radio base station treat a specified carrier (that meetsa certain condition) differently from the other carriers (unspecifiedcarriers) for scaling.

The specified carrier may be at least one of the following carriers 1 to3.

-   -   Carrier 1: carrier configured as a PCell    -   Carrier 2: carrier configured as a PSCell    -   Carrier 3: carrier specified for scaling by an NW (network, base        station, gNB, eNB, or the like)

The specified carrier may be an SpCell (Special Cell). The SpCell may bea PCell in an MCG (Master Cell Group) in DC or a PSCell in an SCG(Secondary Cell Group), or a PCell in any other case.

The specified carrier may be treated by using at least one of followingcalculation methods 1 and 2.

Calculation method 1: for counting of the number of carriers used forscaling, a counting method for the specified carrier differs from acounting method for the other carriers. For example, at least one offollowing counting methods 1 and 2 may be used.

Counting method 1: in scaling of the other carriers, one specifiedcarrier is counted by using a value larger than 1.

Counting method 2: in scaling of the specified carrier, one specifiedcarrier is counted by using a value larger than 1.

According to calculation method 1, each carrier can be given priority.

Calculation method 2: a scaling variable (scaling factor) that isdifferent from a scaling factor using the number of carriers is definedand applied. For example, at least one of following scaling variables 1and 2 may be used.

Scaling variable 1: the scaling variable is applied only to thespecified carrier or to the other carriers.

Scaling variable 2: different values of the scaling variable are appliedto the specified carrier and to the other carriers.

The scaling variable for at least one of the specified carrier and theother carriers may be signal from the NW by the higher layer signalingor the like. The signaling allows the NW to flexibly configure thescaling and configure priority for each carrier.

A scaling factor K_(SMTC_X) for one carrier with a periodicity SMTC_Xmay be derived by following Formula (1).

[Formula  1] $\begin{matrix}{K_{{SMTC}\_ X} = \frac{\left( \frac{\max\left\{ {SMTC} \right\} \times \left( {\alpha + 1} \right)}{SMTC\_ X} \right)}{\begin{matrix}\left\lfloor \left\{ {\frac{\max\left\{ {SMTC} \right\} \times \left( {\alpha + 1} \right)}{SMTC\_ X} -} \right. \right. \\\left. {\left. {\Sigma_{Y}\frac{\max\left\{ {SMTC} \right\} \times \left( {\beta + 1} \right)}{K_{{SMTC}\_ Y} \times {SMTC\_ Y}}} \right\}\text{/}\left( {\gamma + 1} \right)} \right\rfloor\end{matrix}}} & (1)\end{matrix}$

Here, SMTC_X is an SMTC periodicity to be calculated. SMTC_Y representsan SMTC periodicity which are longer than SMTC_X, among the SMTCperiodicities configured for carriers to be measured. max{SMTC}represents the maximum SMTC periodicity for all the carriers to bemeasured.

α represents the number of carriers including an SMTC window overlappingthe SMTC window with the maximum SMTC periodicity, other than thecarrier configured by the maximum SMTC periodicity.

β represents the number of carriers including an SMTC window having anSMTC periodicity smaller than SMTC_Y and overlapping the SMTC windowwith SMTC_Y, other than the carrier configured by SMTC_Y.

γ represents the number of carriers including an SMTC window having anSMTC periodicity smaller than SMTC_X and overlapping the SMTC windowwith SMTC_X, other than the carrier configured by SMTC_X.

K_(SMTC_Y) represents a scaling factor for SMTC_Y.

In a case where SMTC_X and an offset are configured for a plurality ofcarriers (N_(freq_SMTC_X) carriers), K_(SMTC_X) for each carrier may bescaled by a factor of N_(freq_SMTC_X).

Based on K_(SMTC_X), the periodicity and delay requirement for theintra-frequency measurement for the carrier configured with SMTC_X areeach scaled by a factor of K_(SMTC_X).

<Case with No Specified Carrier>

As shown in FIG. 2 , a case will be described in which CC #0, CC #1, andCC #2 are configured, SMTC_A=20 ms is configured for CC #0, SMTC_B=40 msis configured for CC #1, and SMTC_C=80 ms is configured for CC #2.

In a case where K_(SMTC_C) for CC #2 is determined as K_(SMTC_X), theparameters are as follows.

α=γ=2 and β=0

max{SMTC}=80

N_(freq_SMTC_C)=1

In this case, Formula (1) is represented by following Formula (2).

[Formula  2] $\begin{matrix}{K_{{SMTC}\_ C} = {\frac{\frac{80 \times \left( {2 + 1} \right)}{80}}{\left\lfloor {\left\{ {\frac{80 \times \left( {2 + 1} \right)}{80} - 0} \right\}\text{/}\left( {2 + 1} \right)} \right\rfloor} = 3}} & (2)\end{matrix}$

Based on K_(SMTC_C)=3, the UE may measure CC #2 once for every threeSMTC windows.

In a case where K_(SMTC_B) for CC #1 is determined as K_(SMTC_X), theparameters are as follows.

α=2, γ=1 and β=2

max{SMTC}=80

N_(freq_SMTC_B)=1

In this case, Formula (1) is represented by following Formula (3).

[Formula  3] $\begin{matrix}{K_{{SMTC}\_ B} = {\frac{\frac{80 \times \left( {2 + 1} \right)}{40}}{\left\lfloor {\left\{ {\frac{80 \times \left( {2 + 1} \right)}{40} - \frac{80 \times \left( {2 + 1} \right)}{3 \times 80}} \right\}\text{/}\left( {1 + 1} \right)} \right\rfloor} = 3}} & (3)\end{matrix}$

Based on K_(SMTC_B)=3, the UE may measure CC #1 once for every threeSMTC windows.

In a case where K_(SMTC_A) for CC #0 is determined as K_(SMTC_X), theparameters are as follows.

α=2 and γ=1

β=2 (β for the carrier configured with SMTC_C)

β=1 (β for the carrier configured with SMTC_B)

max{SMTC}=80

N_(freq_SMTC_A)=1

In this case, Formula (1) is represented by following Formula (4).

     [Formula  4] $\begin{matrix}{K_{{SMTC}\_ A} = {\frac{\frac{80 \times \left( {2 + 1} \right)}{20}}{\left\lfloor {\left\{ {\frac{80 \times \left( {2 + 1} \right)}{20} - \frac{80 \times \left( {2 + 1} \right)}{3 \times 80} - \frac{80 \times \left( {1 + 1} \right)}{3 \times 40}} \right\}\text{/}\left( {0 + 1} \right)} \right\rfloor} = \frac{4}{3}}} & (4)\end{matrix}$

Based on K_(SMTC_A)= 4/3, the UE may measure CC #0 three times for everyfour SMTC windows.

<Case with Specified Carrier>

In derivation of α, β, and γ for the scaling factor for the othercarriers, a weight larger than 1 (certain number, coefficient,increment, or step, for example, 2) may be counted for one specifiedcarrier (for example, PCell).

In derivation of α, β, and γ for the scaling factor for the specifiedcarrier, 1 may be counted for one of the other carriers, and an obtainedscaling factor may be divided by the above-described certain number.

The weight for the PCell may be the same as the weight for the PSCell.The weight for the PCell may be larger than the weight for the PSCell.

The weight for the specified carrier may be indicated from the NW byusing the higher layer signaling or the like.

As shown in FIG. 3 , a case will be described in which CC #0, CC #1, CC#2, and CC #3 are configured, SMTC_A=20 ms is configured for CC #0 andCC #3, SMTC_B=40 ms is configured for CC #1, SMTC_C=80 ms is configuredfor CC #2 and CC #3, and offsets with different SMTCs are configured forCC #2 and CC #3. Here, CC #0 is configured to be a specified carrier.

In a case where K_(SMTC_C) for CC #2 (other carrier) is determined asK_(SMTC_X), the parameters are as follows.

α=γ=3 and β=0

max{SMTC}=80

N_(freq_SMTC_C)=1

In this case, Formula (1) is represented by following Formula (5).

[Formula  5] $\begin{matrix}{K_{{SMTC}\_ C} = {\frac{\frac{80 \times \left( {3 + 1} \right)}{80}}{\left\lfloor {\left\{ {\frac{80 \times \left( {3 + 1} \right)}{80} - 0} \right\}\text{/}\left( {3 + 1} \right)} \right\rfloor} = 4}} & (5)\end{matrix}$

Based on K_(SMTC_C)=3, the UE may measure CC #2 once for every four SMTCwindows.

In a case where K_(SMTC_B) for CC #1 is determined as K_(SMTC_X), theparameters are as follows.

α=3, γ=2, and β=3

max{SMTC}=80

N_(freq_SMTC_B)=1

In this case, Formula (1) is represented by following Formula (6).

[Formula  6] $\begin{matrix}{K_{{SMTC}\_ B} = {\frac{\frac{80 \times \left( {3 + 1} \right)}{40}}{\left\lfloor {\left\{ {\frac{80 \times \left( {3 + 1} \right)}{40} - \frac{80 \times \left( {3 + 1} \right)}{4 \times 80}} \right\}\text{/}\left( {2 + 1} \right)} \right\rfloor} = 4}} & (6)\end{matrix}$

Based on K_(SMTC_B)=4, the UE may measure CC #1 once for every four SMTCwindows.

In a case where K_(SMTC_A) for CC #0 and CC #3 is determined asK_(SMTC_X), the parameters are as follows.

α=3 and γ=0

β=3 (β for the carrier configured with SMTC_C)

β=2 (β for the carrier configured with SMTC_B)

max{SMTC}=80

N_(freq_SMTC_A)=2

In this case, Formula (1) is represented by following Formula (7).

     [Formula  7] $\begin{matrix}{K_{{SMTC}\_ A} = {\frac{\frac{80 \times \left( {3 + 1} \right)}{20}}{\left\lfloor {\left\{ {\frac{80 \times \left( {3 + 1} \right)}{20} - \frac{80 \times \left( {3 + 1} \right)}{4 \times 80} - \frac{80 \times \left( {2 + 1} \right)}{4 \times 40}} \right\}\text{/}\left( {0 + 1} \right)} \right\rfloor} = \frac{16}{13}}} & (7)\end{matrix}$

Furthermore, N_(freq_SMTC_A)>1, and thus K_(SMTC_A) may be scaled by afactor of N_(freq_SMTC_A). Furthermore, since CC #0 is a specifiedcarrier, K_(SMTC_A) may be scaled by a factor of 1/N_(freq_SMTC_A). Inthis case, K_(SMTC_A) is expressed by following Formula (8).

[Formula  8] $\begin{matrix}{{K_{{SMTC}\_ A} \times N_{{{freq}\_{SMTC}}{\_ A}}\text{/}N_{{{freq}\_{SMTC}}{\_ A}}} = \frac{16}{13}} & (8)\end{matrix}$

Based on K_(SMTC_C)= 16/13, the UE may measure CC #1 13 times for every16 SMTC windows.

The delay requirement is thus determined, allowing priority to be givento the specified carrier in the intra-frequency measurement.

(Radio Communication System)

Hereinafter, a structure of a radio communication system according toone embodiment of the present disclosure will be described. In thisradio communication system, the radio communication method according toeach embodiment of the present disclosure described above may be usedalone or may be used in combination for communication.

FIG. 4 is a diagram to show an example of a schematic structure of theradio communication system according to one embodiment. A radiocommunication system 1 can adopt carrier aggregation (CA) and/or dualconnectivity (DC) to group a plurality of fundamental frequency blocks(component carriers) into one, where the system bandwidth in an LTEsystem (for example, 20 MHz) constitutes one unit.

Note that the radio communication system 1 may be referred to as “LTE(Long Term Evolution),” “LTE-A (LTE-Advanced),” “LTE-B (LTE-Beyond),”“SUPER 3G,” “IMT-Advanced,” “4G (4th generation mobile communicationsystem),” “5G (5th generation mobile communication system),” “NR (NewRadio),” “FRA (Future Radio Access),” “New-RAT (Radio AccessTechnology),” and so on, or may be referred to as a system implementingthese.

The radio communication system 1 includes a radio base station 11 thatforms a macro cell C1 of a relatively wide coverage, and radio basestations 12 (12 a to 12 c) that form small cells C2, which are placedwithin the macro cell C1 and which are narrower than the macro cell C1.Also, user terminals 20 are placed in the macro cell C1 and in eachsmall cell C2. The arrangement, the number, and the like of each celland user terminal 20 are by no means limited to the aspect shown in thediagram.

The user terminals 20 can connect with both the radio base station 11and the radio base stations 12. It is assumed that the user terminals 20use the macro cell C1 and the small cells C2 at the same time by meansof CA or DC. The user terminals 20 can execute CA or DC by using aplurality of cells (CCs).

Between the user terminals 20 and the radio base station 11,communication can be carried out by using a carrier of a relatively lowfrequency band (for example, 2 GHz) and a narrow bandwidth (referred toas, for example, an “existing carrier,” a “legacy carrier” and so on).Meanwhile, between the user terminals 20 and the radio base stations 12,a carrier of a relatively high frequency band (for example, 3.5 GHz, 5GHz, and so on) and a wide bandwidth may be used, or the same carrier asthat used between the user terminals 20 and the radio base station 11may be used. Note that the structure of the frequency band for use ineach radio base station is by no means limited to these.

The user terminals 20 can perform communication by using time divisionduplex (TDD) and/or frequency division duplex (FDD) in each cell.Furthermore, in each cell (carrier), a single numerology may beemployed, or a plurality of different numerologies may be employed.

Numerologies may be communication parameters applied to transmissionand/or reception of a certain signal and/or channel, and for example,may indicate at least one of a subcarrier spacing, a bandwidth, a symbollength, a cyclic prefix length, a subframe length, a TTI length, thenumber of symbols per TTI, a radio frame structure, a particular filterprocessing performed by a transceiver in a frequency domain, aparticular windowing processing performed by a transceiver in a timedomain, and so on. For example, if certain physical channels usedifferent subcarrier spacings of the OFDM symbols constituted and/ordifferent numbers of the OFDM symbols, it may be referred to as that thenumerologies are different.

A wired connection (for example, means in compliance with the CPRI(Common Public Radio Interface) such as an optical fiber, an X2interface and so on) or a wireless connection may be established betweenthe radio base station 11 and the radio base stations 12 (or between tworadio base stations 12).

The radio base station 11 and the radio base stations 12 are eachconnected with a higher station apparatus 30, and are connected with acore network 40 via the higher station apparatus 30. Note that thehigher station apparatus 30 may be, for example, access gatewayapparatus, a radio network controller (RNC), a mobility managemententity (MME) and so on, but is by no means limited to these. Also, eachradio base station 12 may be connected with the higher station apparatus30 via the radio base station 11.

Note that the radio base station 11 is a radio base station having arelatively wide coverage, and may be referred to as a “macro basestation,” a “central node,” an “eNB (eNodeB),” a “transmitting/receivingpoint” and so on. The radio base stations 12 are radio base stationshaving local coverages, and may be referred to as “small base stations,”“micro base stations,” “pico base stations,” “femto base stations,”“HeNBs (Home eNodeBs),” “RRHs (Remote Radio Heads),”“transmitting/receiving points” and so on. Hereinafter, the radio basestations 11 and 12 will be collectively referred to as “radio basestations 10,” unless specified otherwise.

Each of the user terminals 20 is a terminal that supports variouscommunication schemes such as LTE and LTE-A, and may include not onlymobile communication terminals (mobile stations) but stationarycommunication terminals (fixed stations).

In the radio communication system 1, as radio access schemes, orthogonalfrequency division multiple access (OFDMA) is applied to the downlink,and single carrier frequency division multiple access (SC-FDMA) and/orOFDMA is applied to the uplink.

OFDMA is a multi-carrier communication scheme to perform communicationby dividing a frequency band into a plurality of narrow frequency bands(subcarriers) and mapping data to each subcarrier. SC-FDMA is a singlecarrier communication scheme to mitigate interference between terminalsby dividing the system bandwidth into bands formed with one orcontinuous resource blocks per terminal, and allowing a plurality ofterminals to use mutually different bands. Note that the uplink anddownlink radio access schemes are by no means limited to thecombinations of these, and other radio access schemes may be used.

In the radio communication system 1, a downlink shared channel (PDSCH(Physical Downlink Shared Channel), which is used by each user terminal20 on a shared basis, a broadcast channel (PBCH (Physical BroadcastChannel)), downlink L1/L2 control channels and so on, are used asdownlink channels. User data, higher layer control information, SIBs(System Information Blocks) and so on are communicated on the PDSCH. TheMIBs (Master Information Blocks) are communicated on the PBCH.

The downlink L1/L2 control channels include a PDCCH (Physical DownlinkControl Channel), an EPDCCH (Enhanced Physical Downlink ControlChannel), a PCFICH (Physical Control Format Indicator Channel), a PHICH(Physical Hybrid-ARQ Indicator Channel) and so on. Downlink controlinformation (DCI), including PDSCH and/or PUSCH scheduling information,and so on are communicated on the PDCCH.

Note that the DCI scheduling DL data reception may be referred to as “DLassignment,” and the DCI scheduling UL data transmission may be referredto as “UL grant.”

The number of OFDM symbols to use for the PDCCH is communicated on thePCFICH. Transmission confirmation information (for example, alsoreferred to as “retransmission control information,” “HARQ-ACK,”“ACK/NACK,” and so on) of HARQ (Hybrid Automatic Repeat reQuest) to aPUSCH is transmitted on the PHICH. The EPDCCH is frequency-divisionmultiplexed with the PDSCH (downlink shared data channel) and used tocommunicate DCI and so on, like the PDCCH.

In the radio communication system 1, an uplink shared channel (PUSCH(Physical Uplink Shared Channel)), which is used by each user terminal20 on a shared basis, an uplink control channel (PUCCH (Physical UplinkControl Channel)), a random access channel (PRACH (Physical RandomAccess Channel)) and so on are used as uplink channels. User data,higher layer control information and so on are communicated on thePUSCH. In addition, radio quality information (CQI (Channel QualityIndicator)) of the downlink, transmission confirmation information,scheduling request (SR), and so on are transmitted on the PUCCH. Bymeans of the PRACH, random access preambles for establishing connectionswith cells are communicated.

In the radio communication system 1, a cell-specific reference signal(CRS), a channel state information-reference signal (CSI-RS), ademodulation reference signal (DMRS), a positioning reference signal(PRS), and so on are transmitted as downlink reference signals. In theradio communication system 1, a measurement reference signal (SRS(Sounding Reference Signal)), a demodulation reference signal (DMRS),and so on are transmitted as uplink reference signals. Note that DMRSmay be referred to as a “user terminal specific reference signal(UE-specific Reference Signal).” Transmitted reference signals are by nomeans limited to these.

(Radio Base Station)

FIG. 5 is a diagram to show an example of an overall structure of theradio base station according to one embodiment. A radio base station 10includes a plurality of transmitting/receiving antennas 101, amplifyingsections 102, transmitting/receiving sections 103, a baseband signalprocessing section 104, a call processing section 105 and a transmissionline interface 106. Note that the radio base station 10 may beconfigured to include one or more transmitting/receiving antennas 101,one or more amplifying sections 102 and one or moretransmitting/receiving sections 103.

User data to be transmitted from the radio base station 10 to the userterminal 20 by the downlink is input from the higher station apparatus30 to the baseband signal processing section 104, via the transmissionline interface 106.

In the baseband signal processing section 104, the user data issubjected to transmission processes, such as a PDCP (Packet DataConvergence Protocol) layer process, division and coupling of the userdata, RLC (Radio Link Control) layer transmission processes such as RLCretransmission control, MAC (Medium Access Control) retransmissioncontrol (for example, an HARQ transmission process), scheduling,transport format selection, channel coding, an inverse fast Fouriertransform (IFFT) process, and a precoding process, and the result isforwarded to each transmitting/receiving section 103. Furthermore,downlink control signals are also subjected to transmission processessuch as channel coding and inverse fast Fourier transform, and theresult is forwarded to each transmitting/receiving section 103.

The transmitting/receiving sections 103 convert baseband signals thatare pre-coded and output from the baseband signal processing section 104on a per antenna basis, to have radio frequency bands and transmit theresult. The radio frequency signals having been subjected to frequencyconversion in the transmitting/receiving sections 103 are amplified inthe amplifying sections 102, and transmitted from thetransmitting/receiving antennas 101. The transmitting/receiving sections103 can be constituted with transmitters/receivers,transmitting/receiving circuits or transmitting/receiving apparatus thatcan be described based on general understanding of the technical fieldto which the present disclosure pertains. Note that eachtransmitting/receiving section 103 may be structured as atransmitting/receiving section in one entity, or may be constituted witha transmitting section and a receiving section.

Meanwhile, as for uplink signals, radio frequency signals that arereceived in the transmitting/receiving antennas 101 are amplified in theamplifying sections 102. The transmitting/receiving sections 103 receivethe uplink signals amplified in the amplifying sections 102. Thetransmitting/receiving sections 103 convert the received signals intothe baseband signal through frequency conversion and outputs to thebaseband signal processing section 104.

In the baseband signal processing section 104, user data that isincluded in the uplink signals that are input is subjected to a fastFourier transform (FFT) process, an inverse discrete Fourier transform(IDFT) process, error correction decoding, a MAC retransmission controlreceiving process, and RLC layer and PDCP layer receiving processes, andforwarded to the higher station apparatus 30 via the transmission lineinterface 106. The call processing section 105 performs call processing(setting up, releasing and so on) for communication channels, managesthe state of the radio base station 10, manages the radio resources andso on.

The transmission line interface 106 transmits and/or receives signals toand/or from the higher station apparatus 30 via a certain interface. Thetransmission line interface 106 may transmit and/or receive signals(backhaul signaling) with other radio base stations 10 via an inter-basestation interface (for example, an optical fiber in compliance with theCPRI (Common Public Radio Interface) and an X2 interface).

Note that the transmitting/receiving section 103 may further include ananalog beam forming section that performs analog beam forming. Theanalog beam forming section may be constituted with an analog beamforming circuit (for example, a phase shifter or a phase shift circuit)or analog beam forming apparatus (for example, a phase shifter) that canbe described based on general understanding of the technical field towhich the present invention pertains. The transmitting/receiving antenna101 may be constituted with, for example, an array antenna.

The transmitting/receiving section 103 transmits and/or receives data ina cell included in a carrier configured with SMTC. Thetransmitting/receiving sections 103 may transmit information about theintra-frequency measurement and/or inter-frequency measurement and so onto the user terminal 20.

FIG. 6 is a diagram to show an example of a functional structure of theradio base station according to one embodiment of the presentdisclosure. Note that, the present example primarily shows functionalblocks that pertain to characteristic parts of the present embodiment,and it is assumed that the radio base station 10 may include otherfunctional blocks that are necessary for radio communication as well.

The baseband signal processing section 104 at least includes a controlsection (scheduler) 301, a transmission signal generation section 302, amapping section 303, a received signal processing section 304, and ameasurement section 305. Note that these structures may be included inthe radio base station 10, and some or all of the structures do not needto be included in the baseband signal processing section 104.

The control section (scheduler) 301 controls the whole of the radio basestation 10. The control section 301 can be constituted with acontroller, a control circuit or control apparatus that can be describedbased on general understanding of the technical field to which thepresent disclosure pertains.

The control section 301, for example, controls the generation of signalsin the transmission signal generation section 302, the mapping ofsignals by the mapping section 303, and so on. The control section 301controls the signal receiving processes in the received signalprocessing section 304, the measurements of signals in the measurementsection 305, and so on.

The control section 301 controls the scheduling (for example, resourceassignment) of system information, a downlink data signal (for example,a signal transmitted on the PDSCH), a downlink control signal (forexample, a signal transmitted on the PDCCH and/or the EPDCCH.transmission confirmation information, and so on). Based on the resultsof determining necessity or not of retransmission control to the uplinkdata signal, or the like, the control section 301 controls generation ofa downlink control signal, a downlink data signal, and so on.

The control section 301 controls the scheduling of a synchronizationsignal (for example, PSS (Primary Synchronization Signal)/SSS (SecondarySynchronization Signal)), a downlink reference signal (for example, CRS,CSI-RS, DMRS), and so on.

The control section 301 controls the scheduling of an uplink data signal(for example, a signal transmitted on the PUSCH), an uplink controlsignal (for example, a signal transmitted on the PUCCH and/or the PUSCH.transmission confirmation information, and so on), a random accesspreamble (for example, a signal transmitted on the PRACH), an uplinkreference signal, and so on.

The control section 301 may provide control to form a transmission beamand/or a reception beam by using digital BF (for example, precoding) inthe baseband signal processing section 104 and/or analog BF (forexample, phase rotation) in the transmitting/receiving section 103. Thecontrol section 301 may provide control to form a beam, based ondownlink channel information, uplink channel information, and so on. Thechannel information may be acquired from the received signal processingsection 304 and/or the measurement section 305.

The control section 301 may configure the intra-frequency measurementfor each of a plurality of carriers. The control section 301 mayconfigure a periodicity for a measurement timing for each of theintra-frequency measurement and schedule the periodicity, based on theconfiguration of each of the plurality of carriers. In the scheduling,processing for the specified carrier among the plurality of carriers maydiffer from processing for the unspecified carriers.

The transmission signal generation section 302 generates downlinksignals (downlink control signals, downlink data signals, downlinkreference signals and so on) based on commands from the control section301 and outputs the downlink signals to the mapping section 303. Thetransmission signal generation section 302 can be constituted with asignal generator, a signal generation circuit or signal generationapparatus that can be described based on general understanding of thetechnical field to which the present disclosure pertains.

For example, the transmission signal generation section 302 generates DLassignment to signal assignment information of downlink data and/or ULgrant to signal assignment information of uplink data, based on commandsfrom the control section 301. The DL assignment and the UL grant areboth DCI, and follow the DCI format. For a downlink data signal,encoding processing and modulation processing are performed inaccordance with a coding rate, modulation scheme, or the like determinedbased on channel state information (CSI) from each user terminal 20.

The mapping section 303 maps the downlink signals generated in thetransmission signal generation section 302 to certain radio resources,based on commands from the control section 301, and outputs these to thetransmitting/receiving sections 103. The mapping section 303 can beconstituted with a mapper, a mapping circuit or mapping apparatus thatcan be described based on general understanding of the technical fieldto which the present disclosure pertains.

The received signal processing section 304 performs receiving processes(for example, demapping, demodulation, decoding and so on) of receivedsignals that are input from the transmitting/receiving sections 103.Here, the received signals are, for example, uplink signals that aretransmitted from the user terminals 20 (uplink control signals, uplinkdata signals, uplink reference signals and so on). The received signalprocessing section 304 can be constituted with a signal processor, asignal processing circuit or signal processing apparatus that can bedescribed based on general understanding of the technical field to whichthe present disclosure pertains.

The received signal processing section 304 outputs the decodedinformation acquired through the receiving processes to the controlsection 301. For example, if the received signal processing section 304receives the PUCCH including HARQ-ACK, the received signal processingsection 304 outputs the HARQ-ACK to the control section 301. Thereceived signal processing section 304 outputs the received signalsand/or the signals after the receiving processes to the measurementsection 305.

The measurement section 305 conducts measurements with respect to thereceived signals. The measurement section 305 can be constituted with ameasurer, a measurement circuit or measurement apparatus that can bedescribed based on general understanding of the technical field to whichthe present disclosure pertains.

For example, the measurement section 305 may perform RRM (Radio ResourceManagement) measurement, CSI (Channel State Information) measurement,and so on, based on the received signal. The measurement section 305 maymeasure a received power (for example, RSRP (Reference Signal ReceivedPower)), a received quality (for example, RSRQ (Reference SignalReceived Quality), an SINR (Signal to Interference plus Noise Ratio), anSNR (Signal to Noise Ratio)), a signal strength (for example, RSSI(Received Signal Strength Indicator)), channel information (for example,CSI), and so on. The measurement results may be output to the controlsection 301.

(User Terminal)

FIG. 7 is a diagram to show an example of an overall structure of a userterminal according to one embodiment. A user terminal 20 includes aplurality of transmitting/receiving antennas 201, amplifying sections202, transmitting/receiving sections 203, a baseband signal processingsection 204 and an application section 205. Note that the user terminal20 may be configured to include one or more transmitting/receivingantennas 201, one or more amplifying sections 202 and one or moretransmitting/receiving sections 203.

Radio frequency signals that are received in the transmitting/receivingantennas 201 are amplified in the amplifying sections 202. Thetransmitting/receiving sections 203 receive the downlink signalsamplified in the amplifying sections 202. The transmitting/receivingsections 203 convert the received signals into baseband signals throughfrequency conversion, and output the baseband signals to the basebandsignal processing section 204. The transmitting/receiving sections 203can be constituted with transmitters/receivers, transmitting/receivingcircuits or transmitting/receiving apparatus that can be described basedon general understanding of the technical field to which the presentdisclosure pertains. Note that each transmitting/receiving section 203may be structured as a transmitting/receiving section in one entity, ormay be constituted with a transmitting section and a receiving section.

The baseband signal processing section 204 performs, on each inputbaseband signal, an FFT process, error correction decoding, aretransmission control receiving process, and so on. The downlink userdata is forwarded to the application section 205. The applicationsection 205 performs processes related to higher layers above thephysical layer and the MAC layer, and so on. In the downlink data,broadcast information may be also forwarded to the application section205.

Meanwhile, the uplink user data is input from the application section205 to the baseband signal processing section 204. The baseband signalprocessing section 204 performs a retransmission control transmissionprocess (for example, an HARQ transmission process), channel coding,precoding, a discrete Fourier transform (DFT) process, an IFFT processand so on, and the result is forwarded to the transmitting/receivingsection 203.

The transmitting/receiving sections 203 convert the baseband signalsoutput from the baseband signal processing section 204 to have radiofrequency band and transmit the result. The radio frequency signalshaving been subjected to frequency conversion in thetransmitting/receiving sections 203 are amplified in the amplifyingsections 202, and transmitted from the transmitting/receiving antennas201.

Note that the transmitting/receiving section 203 may further include ananalog beam forming section that performs analog beam forming. Theanalog beam forming section may be constituted with an analog beamforming circuit (for example, a phase shifter or a phase shift circuit)or analog beam forming apparatus (for example, a phase shifter) that canbe described based on general understanding of the technical field towhich the present invention pertains. The transmitting/receiving antenna201 may be constituted with, for example, an array antenna.

The transmitting/receiving section 203 transmits and/or receives data ina cell included in a carrier configured with SMTC. Thetransmitting/receiving sections 203 may receive information about theintra-frequency measurement and/or inter-frequency measurement and so onfrom the radio base station 10.

FIG. 8 is a diagram to show an example of a functional structure of auser terminal according to one embodiment. Note that, the presentexample primarily shows functional blocks that pertain to characteristicparts of the present embodiment, and it is assumed that the userterminal 20 may include other functional blocks that are necessary forradio communication as well.

The baseband signal processing section 204 provided in the user terminal20 at least includes a control section 401, a transmission signalgeneration section 402, a mapping section 403, a received signalprocessing section 404 and a measurement section 405. Note that thesestructures may be included in the user terminal 20, and some or all ofthe structures do not need to be included in the baseband signalprocessing section 204.

The control section 401 controls the whole of the user terminal 20. Thecontrol section 401 can be constituted with a controller, a controlcircuit or control apparatus that can be described based on generalunderstanding of the technical field to which the present disclosurepertains.

The control section 401, for example, controls the generation of signalsin the transmission signal generation section 402, the mapping ofsignals by the mapping section 403, and so on. The control section 401controls the signal receiving processes in the received signalprocessing section 404, the measurements of signals in the measurementsection 405, and so on.

The control section 401 acquires a downlink control signal and adownlink data signal transmitted from the radio base station 10, fromthe received signal processing section 404. The control section 401controls generation of an uplink control signal and/or an uplink datasignal, based on the results of determining necessity or not ofretransmission control to a downlink control signal and/or a downlinkdata signal.

The control section 401 may provide control to form a transmission beamand/or a reception beam by using digital BF (for example, precoding) inthe baseband signal processing section 204 and/or analog BF (forexample, phase rotation) in the transmitting/receiving section 203. Thecontrol section 401 may provide control to form a beam, based ondownlink channel information, uplink channel information, and so on. Thechannel information may be acquired from the received signal processingsection 404 and/or the measurement section 405.

The control section 401 may control the intra-frequency measurement foreach of a plurality of carriers (for example, CCs). A periodicity for ameasurement timing (for example, an SMTC window) may be configured foreach of the intra-frequency measurement. The control section 401 mayschedule the periodicity, based on the configuration of each of theplurality of carriers. In the scheduling, the processing for thespecified carrier among the plurality of carriers may differ from theprocessing for the unspecified carriers.

The control section 401 may determine a coefficient for scaling of theperiodicity, based on the number of carriers (for example, at least oneof α, β, and γ) in which measurement timings overlap.

The control section 401 may perform at least one of counting thespecified carrier using a number larger than 1 in counting the number ofcarriers for determination of the coefficient for the unspecifiedcarriers and counting the unspecified carriers using a number smallerthan 1 in counting the number of carriers for determination of thecoefficient for the specified carrier.

A variable for at least one of the specified carrier and the unspecifiedcarriers is configured, and the control section 401 may scale theperiodicity, based on the variable.

The specified carrier may be at least one of the primary cell, theprimary secondary cell, and the cell configured by the radio basestation 10.

If the control section 401 acquires a variety of information signaled bythe radio base station 10 from the received signal processing section404, the control section 401 may update parameters to use for control,based on the information.

The transmission signal generation section 402 generates uplink signals(uplink control signals, uplink data signals, uplink reference signalsand so on) based on commands from the control section 401, and outputsthe uplink signals to the mapping section 403. The transmission signalgeneration section 402 can be constituted with a signal generator, asignal generation circuit or signal generation apparatus that can bedescribed based on general understanding of the technical field to whichthe present disclosure pertains.

For example, the transmission signal generation section 402 generates anuplink control signal about transmission confirmation information, thechannel state information (CSI), and so on, based on commands from thecontrol section 401. The transmission signal generation section 402generates uplink data signals, based on commands from the controlsection 401. For example, when a UL grant is included in a downlinkcontrol signal that is signaled from the radio base station 10, thecontrol section 401 commands the transmission signal generation section402 to generate the uplink data signal.

The mapping section 403 maps the uplink signals generated in thetransmission signal generation section 402 to radio resources, based oncommands from the control section 401, and outputs the result to thetransmitting/receiving sections 203. The mapping section 403 can beconstituted with a mapper, a mapping circuit or mapping apparatus thatcan be described based on general understanding of the technical fieldto which the present disclosure pertains.

The received signal processing section 404 performs receiving processes(for example, demapping, demodulation, decoding and so on) of receivedsignals that are input from the transmitting/receiving sections 203.Here, the received signals are, for example, downlink signalstransmitted from the radio base station 10 (downlink control signals,downlink data signals, downlink reference signals and so on). Thereceived signal processing section 404 can be constituted with a signalprocessor, a signal processing circuit or signal processing apparatusthat can be described based on general understanding of the technicalfield to which the present disclosure pertains. The received signalprocessing section 404 can constitute the receiving section according tothe present disclosure.

The received signal processing section 404 outputs the decodedinformation acquired through the receiving processes to the controlsection 401. The received signal processing section 404 outputs, forexample, broadcast information, system information, RRC signaling, DCIand so on, to the control section 401. The received signal processingsection 404 outputs the received signals and/or the signals resultingfrom the receiving processes to the measurement section 405.

The measurement section 405 conducts measurements with respect to thereceived signals. For example, the measurement section 405 may perform,on one or both of a first carrier and a second carrier, theintra-frequency measurement and/or inter-frequency measurement usingSSBs. The measurement section 405 can be constituted with a measurer, ameasurement circuit or measurement apparatus that can be described basedon general understanding of the technical field to which the presentdisclosure pertains.

For example, the measurement section 405 may perform RRM measurement,CSI measurement, and so on, based on the received signal. Themeasurement section 405 may measure a received power (for example,RSRP), a received quality (for example, RSRQ, SINR, SNR), a signalstrength (for example, RSSI), channel information (for example, CSI),and so on. The measurement results may be output to the control section401.

(Hardware Structure)

Note that the block diagrams that have been used to describe the aboveembodiments show blocks in functional units. These functional blocks(components) may be implemented in arbitrary combinations of at leastone of hardware and software. Also, the method for implementing eachfunctional block is not particularly limited. That is, each functionalblock may be realized by one piece of apparatus that is physically orlogically coupled, or may be realized by directly or indirectlyconnecting two or more physically or logically separate pieces ofapparatus (for example, via wire, wireless, or the like) and using theseplurality of pieces of apparatus.

For example, a radio base station, a user terminal, and so on accordingto one embodiment of the present disclosure may function as a computerthat executes the processes of the radio communication method of thepresent disclosure. FIG. 9 is a diagram to show an example of a hardwarestructure of the radio base station and the user terminal according toone embodiment. Physically, the above-described radio base station 10and user terminals 20 may each be formed as computer apparatus thatincludes a processor 1001, a memory 1002, a storage 1003, acommunication apparatus 1004, an input apparatus 1005, an outputapparatus 1006, a bus 1007, and so on.

Note that, in the following description, the word “apparatus” may beinterpreted as “circuit,” “device,” “unit,” and so on. The hardwarestructure of the radio base station 10 and the user terminals 20 may bedesigned to include one or a plurality of apparatuses shown in thedrawings, or may be designed not to include part of pieces of apparatus.

For example, although only one processor 1001 is shown, a plurality ofprocessors may be provided. Furthermore, processes may be implementedwith one processor or may be implemented at the same time, in sequence,or in different manners with one or more processors. Note that theprocessor 1001 may be implemented with one or more chips.

Each function of the radio base station 10 and the user terminals 20 isimplemented, for example, by allowing certain software (programs) to beread on hardware such as the processor 1001 and the memory 1002, and byallowing the processor 1001 to perform calculations to controlcommunication via the communication apparatus 1004 and control at leastone of reading and writing of data in the memory 1002 and the storage1003.

The processor 1001 controls the whole computer by, for example, runningan operating system. The processor 1001 may be configured with a centralprocessing unit (CPU), which includes interfaces with peripheralapparatus, control apparatus, computing apparatus, a register, and soon. For example, the above-described baseband signal processing section104 (204), call processing section 105, and so on may be implemented bythe processor 1001.

Furthermore, the processor 1001 reads programs (program codes), softwaremodules, data, and so on from at least one of the storage 1003 and thecommunication apparatus 1004, into the memory 1002, and executes variousprocesses according to these. As for the programs, programs to allowcomputers to execute at least part of the operations of theabove-described embodiments are used. For example, the control section401 of each user terminal 20 may be implemented by control programs thatare stored in the memory 1002 and that operate on the processor 1001,and other functional blocks may be implemented likewise.

The memory 1002 is a computer-readable recording medium, and may beconstituted with, for example, at least one of a ROM (Read Only Memory),an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), aRAM (Random Access Memory), and other appropriate storage media. Thememory 1002 may be referred to as a “register,” a “cache,” a “mainmemory (primary storage apparatus)” and so on. The memory 1002 can storeexecutable programs (program codes), software modules, and the like forimplementing the radio communication method according to one embodimentof the present disclosure.

The storage 1003 is a computer-readable recording medium, and may beconstituted with, for example, at least one of a flexible disk, a floppy(registered trademark) disk, a magneto-optical disk (for example, acompact disc (CD-ROM (Compact Disc ROM) and so on), a digital versatiledisc, a Blu-ray (registered trademark) disk), a removable disk, a harddisk drive, a smart card, a flash memory device (for example, a card, astick, and a key drive), a magnetic stripe, a database, a server, andother appropriate storage media. The storage 1003 may be referred to as“secondary storage apparatus.”

The communication apparatus 1004 is hardware (transmitting/receivingdevice) for allowing inter-computer communication via at least one ofwired and wireless networks, and may be referred to as, for example, a“network device,” a “network controller,” a “network card,” a“communication module,” and so on. The communication apparatus 1004 maybe configured to include a high frequency switch, a duplexer, a filter,a frequency synthesizer, and so on in order to realize, for example, atleast one of frequency division duplex (FDD) and time division duplex(TDD). For example, the above-described transmitting/receiving antennas101 (201), amplifying sections 102 (202), transmitting/receivingsections 103 (203), transmission line interface 106, and so on may beimplemented by the communication apparatus 1004.

The input apparatus 1005 is an input device that receives input from theoutside (for example, a keyboard, a mouse, a microphone, a switch, abutton, a sensor, and so on). The output apparatus 1006 is an outputdevice that allows sending output to the outside (for example, adisplay, a speaker, an LED (Light Emitting Diode) lamp, and so on). Notethat the input apparatus 1005 and the output apparatus 1006 may beprovided in an integrated structure (for example, a touch panel).

Furthermore, these types of apparatus, including the processor 1001, thememory 1002, and others, are connected by a bus 1007 for communicatinginformation. The bus 1007 may be formed with a single bus, or may beformed with buses that vary between pieces of apparatus.

The radio base station 10 and the user terminals 20 may be structured toinclude hardware such as a microprocessor, a digital signal processor(DSP), an ASIC (Application Specific Integrated Circuit), a PLD(Programmable Logic Device), an FPGA (Field Programmable Gate Array),and so on, and part or all of the functional blocks may be implementedby the hardware. For example, the processor 1001 may be implemented withat least one of these pieces of hardware.

(Variations)

Note that the terminology described in the present disclosure and theterminology that is needed to understand the present disclosure may bereplaced by other terms that convey the same or similar meanings. Forexample, at least one of the “channel” and “symbol” may be replaced by a“signal” (“signaling”). “Signals” may be “messages.” A reference signalmay be abbreviated as an “RS,” and may be referred to as a “pilot,” a“pilot signal,” and so on, depending on which standard applies. A“component carrier (CC)” may be referred to as a “cell,” a “frequencycarrier,” a “carrier frequency” and so on.

A radio frame may be constituted of one or a plurality of periods(frames) in the time domain. Each of one or a plurality of periods(frames) constituting a radio frame may be referred to as a “subframe.”Furthermore, a subframe may be constituted of one or a plurality ofslots in the time domain. A subframe may be a fixed time length (forexample, 1 ms) independent of numerology.

Here, numerology may be a communication parameter applied to at leastone of transmission and reception of a certain signal or channel. Forexample, numerology may indicate at least one of a subcarrier spacing(SCS), a bandwidth, a symbol length, a cyclic prefix length, atransmission time interval (TTI), the number of symbols per TTI, a radioframe structure, a particular filter processing performed by atransceiver in the frequency domain, a particular windowing processingperformed by a transceiver in the time domain, and so on.

A slot may be constituted of one or a plurality of symbols in the timedomain (OFDM (Orthogonal Frequency Division Multiplexing) symbols,SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, andso on). A slot may be a time unit based on numerology.

A slot may include a plurality of mini-slots. Each mini-slot may beconstituted of one or a plurality of symbols in the time domain. Amini-slot may be referred to as a “sub-slot.” A mini-slot may beconstituted of symbols fewer than the slots. A PDSCH (or PUSCH)transmitted in a time unit larger than a mini-slot may be referred to as“PDSCH (PUSCH) mapping type A.” A PDSCH (or PUSCH) transmitted using amini-slot may be referred to as “PDSCH (PUSCH) mapping type B.”

A radio frame, a subframe, a slot, a mini-slot, and a symbol all expresstime units in signal communication. A radio frame, a subframe, a slot, amini-slot, and a symbol may each be called by other applicable terms.

For example, one subframe may be referred to as a “transmission timeinterval (TTI),” a plurality of consecutive subframes may be referred toas a “TTI” or one slot or one mini-slot may be referred to as a “TTI.”That is, at least one of a subframe and a TTI may be a subframe (1 ms)in existing LTE, may be a shorter period than 1 ms (for example, 1 to 13symbols), or may be a longer period than 1 ms. Note that a unitexpressing TTI may be referred to as a “slot,” a “mini-slot,” and so oninstead of a “subframe.”

Here, a TTI refers to the minimum time unit of scheduling in radiocommunication, for example. For example, in LTE systems, a radio basestation schedules the allocation of radio resources (such as a frequencybandwidth and transmission power that are available for each userterminal) for the user terminal in TTI units. Note that the definitionof TTIs is not limited to this.

TTIs may be transmission time units for channel-encoded data packets(transport blocks), code blocks, codewords and so on, or may be the unitof processing in scheduling, link adaptation, and so on. Note that, whenTTIs are given, the time interval (for example, the number of symbols)to which transport blocks, code blocks, codewords, or the like areactually mapped may be shorter than the TTIs.

Note that, in the case where one slot or one mini-slot is referred to asa TTI, one or more TTIs (that is, one or more slots or one or moremini-slots) may be the minimum time unit of scheduling. The number ofslots (the number of mini-slots) constituting the minimum time unit ofthe scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a “normal TTI”(TTI in LTE Rel. 8 to Rel. 12), a “long TTI,” a “normal subframe,” a“long subframe” and so on. A TTI that is shorter than a normal TTI maybe referred to as a “shortened TTI,” a “short TTI,” a “partial orfractional TTI,” a “shortened subframe,” a “short subframe,” a“mini-slot,” a “sub-slot” and so on.

Note that a long TTI (for example, a normal TTI, a subframe, and so on)may be interpreted as a TTI having a time length exceeding 1 ms, and ashort TTI (for example, a shortened TTI and so on) may be interpreted asa TTI having a TTI length shorter than the TTI length of a long TTI andequal to or longer than 1 ms.

A resource block (RB) is the unit of resource allocation in the timedomain and the frequency domain, and may include one or a plurality ofconsecutive subcarriers in the frequency domain.

An RB may include one or a plurality of symbols in the time domain, andmay be one slot, one mini-slot, one subframe, or one TTI in length. OneTTI and one subframe each may be constituted of one or a plurality ofresource blocks.

Note that one or a plurality of RBs may be referred to as a “physicalresource block (PRB (Physical RB)),” a “sub-carrier group (SCG),” a“resource element group (REG),” a “PRB pair,” an “RB pair” and so on.

A resource block may be constituted of one or a plurality of resourceelements (REs). For example, one RE may correspond to a radio resourcefield of one subcarrier and one symbol.

Note that the above-described structures of radio frames, subframes,slots, mini-slots, symbols, and so on are merely examples. For example,structures such as the number of subframes included in a radio frame,the number of slots per subframe or radio frame, the number ofmini-slots included in a slot, the numbers of symbols and RBs includedin a slot or a mini-slot, the number of subcarriers included in an RB,the number of symbols in a TTI, the symbol length, the cyclic prefix(CP) length, and so on can be variously changed.

The information, parameters, and so on described in the presentdisclosure may be represented in absolute values or in relative valueswith respect to certain values, or may be represented in anothercorresponding information. For example, radio resources may be specifiedby certain indices.

The names used for parameters and so on in the present disclosure are inno respect limiting. For example, since various channels (PUCCH(Physical Uplink Control Channel), PDCCH (Physical Downlink ControlChannel), and so on) and information elements can be identified by anysuitable names, the various names assigned to these individual channelsand information elements are in no respect limiting.

The information, signals, and so on described in the present disclosuremay be represented by using any of a variety of different technologies.For example, data, instructions, commands, information, signals, bits,symbols, chips, and so on, all of which may be referenced throughout theherein-contained description, may be represented by voltages, currents,electromagnetic waves, magnetic fields or particles, optical fields orphotons, or any combination of these.

Information, signals, and so on can be output in at least one of fromhigher layers to lower layers and from lower layers to higher layers.Information, signals, and so on may be input and/or output via aplurality of network nodes.

The information, signals, and so on that are input and/or output may bestored in a specific location (for example, a memory) or may be managedby using a management table. The information, signals, and so on to beinput and/or output can be overwritten, updated, or appended. Theinformation, signals, and so on that are output may be deleted. Theinformation, signals, and so on that are input may be transmitted toanother apparatus.

Signaling of information is by no means limited to theaspects/embodiments described in the present disclosure, and othermethods may be used as well. For example, signaling of information maybe implemented by using physical layer signaling (for example, downlinkcontrol information (DCI), uplink control information (UCI), higherlayer signaling (for example, RRC (Radio Resource Control) signaling,broadcast information (master information block (MIB), systeminformation blocks (SIBs), and so on), MAC (Medium Access Control)signaling and so on), and other signals and/or combinations of these.

Note that physical layer signaling may be referred to as “L1/L2 (Layer1/Layer 2) control information (L1/L2 control signals),” “L1 controlinformation (L1 control signal),” and so on. Also, RRC signaling may bereferred to as an “RRC message,” and can be, for example, an RRCconnection setup (RRCConnectionSetup) message, an RRC connectionreconfiguration (RRCConnectionReconfiguration) message, and so on. Also,MAC signaling may be signaled using, for example, MAC control elements(MAC CEs).

Also, signaling of certain information (for example, signaling of “Xholds”) does not necessarily have to be signaled explicitly, and can besignaled implicitly (by, for example, not signaling this certaininformation or signaling another piece of information).

Determinations may be made in values represented by one bit (0 or 1),may be made in Boolean values that represent true or false, or may bemade by comparing numerical values (for example, comparison against acertain value).

Software, whether referred to as “software,” “firmware,” “middleware,”“microcode,” or “hardware description language,” or called by otherterms, should be interpreted broadly to mean instructions, instructionsets, code, code segments, program codes, programs, subprograms,software modules, applications, software applications, softwarepackages, routines, subroutines, objects, executable files, executionthreads, procedures, functions, and so on.

Software, commands, information, and so on may be transmitted andreceived via communication media. For example, when software istransmitted from a website, a server, or other remote sources by usingat least one of wired technologies (coaxial cables, optical fibercables, twisted-pair cables, digital subscriber lines (DSL), and so on)and wireless technologies (infrared radiation, microwaves, and so on),at least one of these wired technologies and wireless technologies arealso included in the definition of communication media.

The terms “system” and “network” used in the present disclosure may beused interchangeably.

In the present disclosure, the terms such as a “base station (BS),” a“radio base station,” a “fixed station,” a “NodeB,” an “eNodeB (eNB),” a“gNodeB (gNB),” an “access point,” a “transmission point,” a “receptionpoint,” a “transmission/reception point,” a “cell,” a “sector,” a “cellgroup,” a “carrier,” a “component carrier,” a “bandwidth part (BWP)”,and so on can be used interchangeably. The base station may be referredto as the terms such as a “macro cell,” a small cell,” a “femto cell,” a“pico cell,” and so on.

A base station can accommodate one or a plurality of (for example,three) cells (also referred to as “sectors”). When a base stationaccommodates a plurality of cells, the entire coverage area of the basestation can be partitioned into multiple smaller areas, and each smallerarea can provide communication services through base station subsystems(for example, indoor small base stations (RRHs (Remote Radio Heads))).The term “cell” or “sector” refers to part of or the entire coveragearea of at least one of a base station and a base station subsystem thatprovides communication services within this coverage.

In the present disclosure, the terms “mobile station (MS),” “userterminal,” “user equipment (UE),” and “terminal” and so on may be usedinterchangeably.

A mobile station may be referred to as a “subscriber station,” “mobileunit,” “subscriber unit,” “wireless unit,” “remote unit,” “mobiledevice,” “wireless device,” “wireless communication device,” “remotedevice,” “mobile subscriber station,” “access terminal,” “mobileterminal,” “wireless terminal,” “remote terminal,” “handset,” “useragent,” “mobile client,” “client,” or some other appropriate terms insome cases.

At least one of a base station and a mobile station may be referred toas a “transmitting apparatus,” a “receiving apparatus,” and so on. Notethat at least one of a base station and a mobile station may be devicemounted on a mobile body or a mobile body itself, and so on. The mobilebody may be a vehicle (for example, a car, an airplane, and the like),may be a mobile body which moves unmanned (for example, a drone, anautomatic operation car, and the like), or may be a robot (a manned typeor unmanned type). Note that at least one of a base station and a mobilestation also includes an apparatus which does not necessarily moveduring communication operation.

The radio base station in the present disclosure may be interpreted as auser terminal. For example, each aspect/embodiment of the presentdisclosure may be applied to the structure that replaces a communicationbetween a radio base station and a user terminal with a communicationbetween a plurality of user terminals (for example, which may bereferred to as “D2D (Device-to-Device),” “V2X (Vehicle-to-Everything),”and the like). In this case, the user terminals 20 may have thefunctions of the radio base stations 10 described above. The words“uplink” and “downlink” may be interpreted as the words corresponding tothe terminal-to-terminal communication (for example, “side”). Forexample, an uplink channel, a downlink channel and so on may beinterpreted as a side channel.

Likewise, the user terminal in the present disclosure may be interpretedas a radio base station. In this case, the radio base stations 10 mayhave the functions of the user terminals 20 described above.

Actions which have been described in the present disclosure to beperformed by a base station may, in some cases, be performed by uppernodes. In a network including one or a plurality of network nodes withbase stations, it is clear that various operations that are performed tocommunicate with terminals can be performed by base stations, one ormore network nodes (for example, MMEs (Mobility Management Entities),S-GW (Serving-Gateways), and so on may be possible, but these are notlimiting) other than base stations, or combinations of these.

The aspects/embodiments illustrated in the present disclosure may beused individually or in combinations, which may be switched depending onthe mode of implementation. The order of processes, sequences,flowcharts, and so on that have been used to describe theaspects/embodiments in the present disclosure may be re-ordered as longas inconsistencies do not arise. For example, although various methodshave been illustrated in the present disclosure with various componentsof steps in exemplary orders, the specific orders that are illustratedherein are by no means limiting.

The aspects/embodiments illustrated in the present disclosure may beapplied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B(LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobilecommunication system), 5G (5th generation mobile communication system),FRA (Future Radio Access), New-RAT (Radio Access Technology), NR(NewRadio), NX (New radio access), FX (Future generation radio access), GSM(registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registeredtrademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20,UWB (Ultra-WideBand), Bluetooth (registered trademark), systems that useother adequate radio communication methods and next-generation systemsthat are enhanced based on these. A plurality of systems may be combined(for example, a combination of LTE or LTE-A and 5G, and the like) andapplied.

The phrase “based on” (or “on the basis of”) as used in the presentdisclosure does not mean “based only on” (or “only on the basis of”),unless otherwise specified. In other words, the phrase “based on” (or“on the basis of”) means both “based only on” and “based at least on”(“only on the basis of” and “at least on the basis of”).

Reference to elements with designations such as “first,” “second,” andso on as used in the present disclosure does not generally limit thequantity or order of these elements. These designations may be used inthe present disclosure only for convenience, as a method fordistinguishing between two or more elements. Thus, reference to thefirst and second elements does not imply that only two elements may beemployed, or that the first element must precede the second element insome way.

The term “judging (determining)” as in the present disclosure herein mayencompass a wide variety of actions. For example, “judging(determining)” may be interpreted to mean making “judgments(determinations)” about judging, calculating, computing, processing,deriving, investigating, looking up (for example, searching a table, adatabase, or some other data structures), ascertaining, and so on.

“Judging (determining)” may be interpreted to mean making “judgments(determinations)” about receiving (for example, receiving information),transmitting (for example, transmitting information), input, output,accessing (for example, accessing data in a memory), and so on.

“Judging (determining)” as used herein may be interpreted to mean making“judgments (determinations)” about resolving, selecting, choosing,establishing, comparing, and so on. In other words, “judging(determining)” may be interpreted to mean making “judgments(determinations)” about some action.

“Judging (determining)” may be interpreted as “assuming,” “expecting,”“considering,” and the like.

“The maximum transmit power” according to the present disclosure maymean a maximum value of the transmit power, may mean the nominal maximumtransmit power (the nominal UE maximum transmit power), or may mean therated maximum transmit power (the rated UE maximum transmit power).

The terms “connected” and “coupled,” or any variation of these terms asused in the present disclosure mean all direct or indirect connectionsor coupling between two or more elements, and may include the presenceof one or more intermediate elements between two elements that are“connected” or “coupled” to each other. The coupling or connectionbetween the elements may be physical, logical, or a combination thereof.For example, “connection” may be interpreted as “access.”

In the present disclosure, when two elements are connected, the twoelements may be considered “connected” or “coupled” to each other byusing one or more electrical wires, cables, printed electricalconnections, or the like, and, as some non-limiting and non-inclusiveexamples, by using electromagnetic energy having wavelengths in radiofrequency regions, microwave regions, (both visible and invisible)optical regions, or the like.

In the present disclosure, the phrase “A and B are different” may meanthat “A and B are different from each other.” The terms “separate,” “becoupled” and so on may be interpreted similarly.

When terms such as “include,” “including,” and variations of these areused in the present disclosure, these terms are intended to beinclusive, in a manner similar to the way the term “comprising” is used.Furthermore, the term “or” as used in the present disclosure is intendedto be not an exclusive disjunction.

For example, in the present disclosure, when an article such as “a,”“an,” and “the” in the English language is added by translation, thepresent disclosure may include that a noun after these articles is in aplural form.

Now, although the invention according to the present disclosure has beendescribed in detail above, it should be obvious to a person skilled inthe art that the invention according to the present disclosure is by nomeans limited to the embodiments described in the present disclosure.The invention according to the present disclosure can be implementedwith various corrections and in various modifications, without departingfrom the spirit and scope of the invention defined by the recitations ofclaims. Consequently, the description of the present disclosure isprovided only for the purpose of explaining examples, and should by nomeans be construed to limit the invention according to the presentdisclosure in any way.

The present application is based on JP 2018-090964 filed on Apr. 18,2018. The entire contents of the application are incorporated herein.

What is claimed is:
 1. A terminal comprising: a processor that scales adelay requirement of an intra-frequency measurement based on asynchronization signal block by a scaling factor corresponding to eachof a plurality of carriers; and a receiver that receives thesynchronization signal block in each of the plurality of carriers,wherein the plurality of carriers includes a first carrier and a secondcarrier, wherein a first scaling factor for the first carrier is basedon a number of the plurality of carriers, wherein a second scalingfactor for the second carrier is not based on the number of theplurality of carriers, and wherein the processor increases the delayrequirement by using the first scaling factor and increases the delayrequirement by using the second scaling factor.
 2. The terminalaccording to claim 1, wherein the processor performs the intra-frequencymeasurement without using a measurement gap.
 3. The terminal accordingto claim 1, wherein the receiver receives a parameter that indicates aperiodicity of a measurement of the synchronization signal block foreach of the plurality of carriers, wherein the processor derives ameasurement period for the intra-frequency measurement by multiplying avalue based on the parameter by the scaling factor.
 4. The terminalaccording to claim 1, wherein the second carrier is specified by anetwork.
 5. A radio communication method for a terminal comprising:scaling a delay requirement of an intra-frequency measurement based on asynchronization signal block by a scaling factor corresponding to eachof a plurality of carriers; and receiving the synchronization signalblock in each of the plurality of carriers, wherein the plurality ofcarriers includes a first carrier and a second carrier, wherein a firstscaling factor for the first carrier is based on a number of theplurality of carriers, wherein a second scaling factor for the secondcarrier is not based on the number of the plurality of carriers, andwherein the delay requirement increases by using the first scalingfactor and increases by using the second scaling factor.
 6. The terminalaccording to claim 2, wherein the receiver receives a parameter thatindicates a periodicity of a measurement of the synchronization signalblock for each of the plurality of carriers, wherein the processorderives a measurement period for the intra-frequency measurement bymultiplying a value based on the parameter by the scaling factor.
 7. Theterminal according to claim 2, wherein the second carrier is specifiedby a network.
 8. The terminal according to claim 3, wherein the secondcarrier is specified by a network.
 9. A base station comprising: aprocessor that scales a delay requirement of an intra-frequencymeasurement based on a synchronization signal block by a scaling factorcorresponding to each of a plurality of carriers; and a transmitter thattransmits the synchronization signal block in each of the plurality ofcarriers, wherein the plurality of carriers includes a first carrier anda second carrier, wherein a first scaling factor for the first carrieris based on a number of the plurality of carriers, wherein a secondscaling factor for the second carrier is not based on the number of theplurality of carriers, and wherein the processor increases the delayrequirement by using the first scaling factor and increases the delayrequirement by using the second scaling factor.
 10. A system comprising:a terminal; and a base station, wherein the terminal comprises: aprocessor that scales a delay requirement of an intra-frequencymeasurement based on a synchronization signal block by a scaling factorcorresponding to each of a plurality of carriers; and a receiver thatreceives the synchronization signal block in each of the plurality ofcarriers, wherein the plurality of carriers includes a first carrier anda second carrier, wherein a first scaling factor for the first carrierout of the plurality of carriers is based on a number of the pluralityof carriers, wherein a second scaling factor for the second carrier isnot based on the number of the plurality of carriers, and wherein theprocessor increases the delay requirement by using the first scalingfactor and increases the delay requirement by using the second scalingfactor; and the base station comprises: a transmitter that transmits thesynchronization signal block.